linux-kernel - Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT

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Message-ID: <CAGXu5jLpm7iG17+ws2MfK7ZG9KEDaHWd5xxHSk7KHPyizYEm2A@mail.gmail.com>
Date:	Mon, 23 Nov 2015 10:56:11 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT_DEVM in lib/Kconfig.debug

On Mon, Nov 23, 2015 at 9:12 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> On Mon, Nov 23, 2015 at 12:12 AM, Ingo Molnar <mingo@...nel.org> wrote:
>>
>> * Dan Williams <dan.j.williams@...el.com> wrote:
>>
>>> Let all the archs that implement CONFIG_STRICT_DEVM use a common
>>> definition in lib/Kconfig.debug.
>>
>> For the x86 bit:
>>
>> Acked-by: Ingo Molnar <mingo@...nel.org>
>>
>>> Note, the 'depends on !SPARC' is due to sparc not implementing
>>> devmem_is_allowed().
>>
>> Maybe that should be converted into a helper Kconfig switch for architectures to
>> opt in to /dev/mem restrictions?
>
> Sure, easy enough to add a ARCH_HAS_DEVMEM_IS_ALLOWED opt-in.

Is there some hidden meaning about the difference between ARCH_HAS_...
and HAVE_ARCH_... and HAVE_... ?

-Kees

-- 
Kees Cook
Chrome OS Security
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